In general, a frond is any large divided leaf. The leaves of ferns and palm trees are primarily referred to as fronds, both scientifically and in common English. Fronds have strong center stems off of which small leaflets branch. This structure can be seen in the fern above. Each main branch is one frond, and its smaller triangular leaves are known as pinnae. The spores of ferns develop on the underside of its pinnae.
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